def _save_to_memcache(self):
"""Saves course representation into memcache."""
envelope = SerializableCourseEnvelope()
envelope.units = self._units
envelope.lessons = self._lessons
envelope.references = self._references
MemcacheManager.set(self.memcache_key, envelope)
def isfile(self, afilename):
"""Checks file existence by looking up the datastore row."""
filename = self._logical_to_physical(afilename)
# Check cache.
result = MemcacheManager.get(
self.make_key(filename), namespace=self._ns)
if result:
return True
if NO_OBJECT == result:
return False
# Check datastore.
metadata = FileMetadataEntity.get_by_key_name(filename)
if metadata:
return True
result = False
# Check with parent fs.
if self._inherits_from and self._can_inherit(filename):
result = self._inherits_from.isfile(afilename)
# Put NO_OBJECT marker into memcache to avoid repeated lookups.
if not result:
MemcacheManager.set(
self.make_key(filename), NO_OBJECT, namespace=self._ns)
return result
def isfile(self, afilename):
"""Checks file existence by looking up the datastore row."""
filename = self._logical_to_physical(afilename)
# Check cache.
result = MemcacheManager.get(self.make_key(filename),
namespace=self._ns)
if result:
return True
if NO_OBJECT == result:
return False
# Check datastore.
metadata = FileMetadataEntity.get_by_key_name(filename)
if metadata:
return True
result = False
# Check with parent fs.
if self._inherits_from and self._can_inherit(filename):
result = self._inherits_from.isfile(afilename)
# Put NO_OBJECT marker into memcache to avoid repeated lookups.
if not result:
MemcacheManager.set(self.make_key(filename),
NO_OBJECT,
namespace=self._ns)
return result
def _save_to_memcache(self):
"""Saves course representation into memcache."""
envelope = SerializableCourseEnvelope()
envelope.units = self._units
envelope.lessons = self._lessons
envelope.references = self._references
MemcacheManager.set(self.memcache_key, envelope)
def update_permissions_map(cls):
"""Puts a dictionary mapping users to permissions in memcache.
A dictionary is constructed, using roles information from the datastore,
mapping user emails to dictionaries that map module names to
sets of permissions.
Returns:
The created dictionary.
"""
permissions_map = {}
for role in RoleDAO.get_all():
for user in role.users:
user_permissions = permissions_map.setdefault(user, {})
for (module_name, permissions) in role.permissions.iteritems():
module_permissions = user_permissions.setdefault(module_name, set())
module_permissions.update(permissions)
MemcacheManager.set(cls.memcache_key, permissions_map)
return permissions_map
def update_permissions_map(cls):
"""Puts a dictionary mapping users to permissions in memcache.
A dictionary is constructed, using roles information from the datastore,
mapping user emails to dictionaries that map module names to
sets of permissions.
Returns:
The created dictionary.
"""
permissions_map = {}
for role in RoleDAO.get_all():
for user in role.users:
user_permissions = permissions_map.setdefault(user, {})
for (module_name, permissions) in role.permissions.iteritems():
module_permissions = user_permissions.setdefault(
module_name, set())
module_permissions.update(permissions)
MemcacheManager.set(cls.memcache_key, permissions_map)
return permissions_map
def get(self, afilename):
"""Gets a file from a datastore. Raw bytes stream, no encodings."""
filename = self._logical_to_physical(afilename)
# Load from cache.
result = MemcacheManager.get(self.make_key(filename),
namespace=self._ns)
if result:
return result
if NO_OBJECT == result:
return None
# Load from a datastore.
metadata = FileMetadataEntity.get_by_key_name(filename)
if metadata:
data = FileDataEntity.get_by_key_name(filename)
if data:
result = FileStreamWrapped(metadata, data.data)
MemcacheManager.set(self.make_key(filename),
result,
namespace=self._ns)
return result
result = None
metadata = None
# Load from parent fs.
if self._inherits_from and self._can_inherit(filename):
result = self._inherits_from.get(afilename)
# Cache result.
if result:
result = FileStreamWrapped(metadata, result.read())
MemcacheManager.set(self.make_key(filename),
result,
namespace=self._ns)
else:
MemcacheManager.set(self.make_key(filename),
NO_OBJECT,
namespace=self._ns)
return result
def get(self, afilename):
"""Gets a file from a datastore. Raw bytes stream, no encodings."""
filename = self._logical_to_physical(afilename)
# Load from cache.
result = MemcacheManager.get(
self.make_key(filename), namespace=self._ns)
if result:
return result
if NO_OBJECT == result:
return None
# Load from a datastore.
metadata = FileMetadataEntity.get_by_key_name(filename)
if metadata:
data = FileDataEntity.get_by_key_name(filename)
if data:
result = FileStreamWrapped(metadata, data.data)
MemcacheManager.set(
self.make_key(filename), result, namespace=self._ns)
return result
result = None
metadata = None
# Load from parent fs.
if self._inherits_from and self._can_inherit(filename):
result = self._inherits_from.get(afilename)
# Cache result.
if result:
result = FileStreamWrapped(metadata, result.read())
MemcacheManager.set(
self.make_key(filename), result, namespace=self._ns)
else:
MemcacheManager.set(
self.make_key(filename), NO_OBJECT, namespace=self._ns)
return result
def save(cls, app_context, instance):
"""Saves instance to memcache."""
MemcacheManager.set(
cls._make_key(),
cls.memento_from_instance(instance).serialize(),
namespace=app_context.get_namespace_name())
def save(cls, app_context, instance):
"""Saves instance to memcache."""
MemcacheManager.set(
cls._make_key(),
cls.memento_from_instance(instance).serialize(),
namespace=app_context.get_namespace_name())
